Casing for electric apparatus with the motor resiliently suspended



y 9, 1969 E. J. LOQKMAN 3,458,737

CASING FORELECTRIC APPARATUS WITH THE MOTOR RESILIENTLY SUSPENDED Filed July 8, 1966 INVENTOR. EVERT J. LOOKMAN 2 M Kl? AG T United States Patent 3 458,737 CASING FOR ELECTliIC APPARATUS WITH THE MOTOR RESILIENTLY SUSPENDED Evert Jacobus Lookman, Drachten, Netherlands, assignor, by mesne assignments, to U.S. Philips Corporation, New York, N.Y., a corporation of Delaware Filed July 8, 1966, Ser. No. 563,868 Claims priority, application Netherlands, July 17, 1965, 6509285 Int. Cl. H02k /24 U.S. Cl. 310-51 6 Claims ABSTRACT OF THE DISCLOSURE An electric shaver casing is formed of two similar shells having a vertical plane of intersection, the joined shells defining a continuous ridge around the inside wall. A plate from which an electric motor is suspended has a resilient material around its edge which edge is then secured in the casing adjacent the ridge. Projections along the resilient edge assure a snug fit.

It is known to suspend the motor of a shaving apparatus so that the vibrations produced by the motor are confined as far as possible to a given space. In such apparatus where the motor is directly suspended in a resilient manner, there is still the disadvantage that the vibrations produced, though greatly attenuated, are nevertheless transferred to material in surrounding spaces.

The present invention has for its object to minimize this attenuated transmission of vibrations produced by the motor, and this invention is characterized in that a layer of soft resilient synthetic substance is provided around the edge of plate; this edge then fits between spaced lugs which project inwardly at right angles to the inner wall of the casing, and the vibrations produced in the plate are damped substantially completely owing to the fitting location of the plate.

A further improvement is obtained in that the plate is clamped between the lugs, the soft edge which surrounds the plate being provided on either side at the level of the lugs with vertically projecting parts. Owing to this clamping fit, the vibration produced in the plate is substantially completely damped.

An embodiment in which the transmission of the vibration produced through the surrounding gaseous medium such as air is restricted is characterized in that at the level of the minimum distance between the lugs the inner wall of the casing is provided with a continuous ridge which projects into the interior at right angles to the wall and enclose the plate.

An improvement of this embodiment is characterized in that the periphery of the plate is provided with a thin rim of soft resilient material co-planar with the plate, while the surface enclosed by the ridge is smaller than the surface of the plate so that, when the casing wall portions are drawn against each other end to end, the ridge retains the plate with a clamping fit.

Moreover, this affords the additional advantage that the two spaces are sealed against each other so that no hair cuttings can penetrate into the motor space.

The invention will be described more fully with refer- 3,458,737. Patented July 29, 1969 ence to the accompanying drawing, additional favourable details manifesting themselves in the description.

FIG. 1 is a partial, front elevation of the apparatus, taken along lines II of FIG. 3, and showing the casing in section with the plate in locked position.

In FIG. 3, reference numerals 1 and 2 designate detachable casing wall portions of the envelope which at the joint 3 are drawn against each other end to end, and reference B is the cutaway upper wall shown in section. FIGS. 1 and 2 show that the envelope is divided into two spaces 5 and 6 by a plate 4, with the motor 7 suspended from the plate, and other operative parts of the apparatus in space 5.

The edge of the metal plate 4 is enclosed on both sides by a layer 8 of soft resilient material, and the plate 4 then fits between lugs 9 which protrude perpendicularly inwardly from the inner wall of the envelope. Due to the fact that the edge 8 is provided with projections 10 at the area at which the plate is locked by the lugs 9, the plate 4 fits clampingly between these lugs.

At the level of the shortest distance between the lugs 9, the inner wall of the envelope is provided with a continuous ridge 11 which projects inwards and encloses the plate 4 with the edge 8. The plate 4 is provided at its periphery with a thin coplanar rim 12 of soft resilient material which is pressed against the ridge 11 in the locked position of the plate 4. The diametral dimensions of the plate 4 with the thin rim 12 one slightly larger than the corresponding dimensions of the ridge 11, so that in the locked position the rim 12 is firmly pressed against the ridge 11.

The plate 4 is also provided With a lug 13 which fits into a recess 14 of the ridge 11.

Since both parts of the casing wall have portions of ridge 11 including recess 14, when the rim -12 is pressed against the ridge 11, a uniform pressure is obtainable along the entire edge thereof.

What is claimed is:

1. A casing for an electric apparatus including a motor, comprising: (a) two separate shells joinable in edge-abutting relationship along a plane of separation extending between the top and bottomof the shells, the joined shells defining a chamber between them and each shell having at least one pair of spaced lugs extending from its inner wall generally transverse to said separation plane, (b) a plate positionable in the chamber to define upper and lower parts thereof, the plate having edges mountable in the spaces between said lugs with the motor being suspended from said plate into said lower part, and (c) a resilient material disposed between the edges of said plate and said lugs, for damping vibrations between said motor and the casing.

2. A casing as defined in claim 1 wherein (a) each shell has a continuous engaging surface along its inner wall and extending through the spaces between each pair of lugs, and (b) said resilient material is a rim extending completely around the edges of the plate and engaging said continuous surface thereby sealing the upper part of the chamber from the lower part.

3. A casing as defined in claim 2 wherein the outer dimensions of said rim prior to assembly of said apparatus are greater than the inner dimensions of said engaging surface, the rim being pressed upon assembly to form a securely sealed joint.

3 4 4. A casing as defined in claim 2 wherein said engaging References Cited s lrface defines a groove which includes a recess, and said FOREIGN PATENTS rim further comprises a tongue that fits 1n said recess upon assembly of Said apparatus 737,825 10/ 1955 Great Brltam.

5. A casing as defined in claim 2 wherein the rim is 5 9521197 10/1956 Germanygenerally U-shaped in cross-section and engages the top, bottom and sides of the plates marginal edge. WARREN Pnmary Exammer 6. A casing as defined in claim 5 wherein the rim fur- R. SKUDY, Assistant Examiner ther comprises upward and downward extending projec- U 5 Cl X R tions for engaging said lugs, and an outwardly extending 1O rib around its periphery for contacting said engaging sur- 310-89 face of the shells. 

